U1173 Diagnostic Trouble Code

U1173 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U1173 diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
Malfunction Indicator Lamp (MIL) illuminated

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Dirty air cleaner element Damaged DPF

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code U1173 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U1173.

Fortunately, U1173 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1173 Trouble Code For Specific Cars

U1173 Lotus Etna Traction Control Motor Circuit Failure
U1173 Jaguar Xj-7 Seat Driver Front Up/Down Motor Stalled
U1173 Porsche 718 Front Sounder Circuit Short to Vbatt
U1173 Mercer 35 Air Suspension LF Height Sensor Circuit Failure
U1173 Italdesign Asgard
U1173 Isuzu Wizard SCP (J1850) Invalid or Missing Data for Vehicle Speed
U1173 Mercedes Cl 420 ABS Inlet Valve Coil Rear Circuit Short To Ground